— I don’t understand why you didn’t go to the lecture yesterday afternoon.—I’m so sorry. But I _________ my homework. 
#100590
A
had done
B
was doing
C
would do
D
am doing
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I would have come sooner but I ________ that they were waiting. 
#104791
A
haven’t known
B
hadn’t known
C
don’t know
D
didn’t know
“I can’t do anything with it,”said Bob,__________at the colour TV set.
#103354
A
looking
B
to look
C
looked
D
having looked